TCA9555PWR

This 16-bit I/O expander for two-wire bidirectional bus (I²C) is designed for VCC operating voltages from 1.65V to 5.5V. It provides general-purpose remote I/O expansion for most microcontroller families via the I²C interface. The TCA9555 consists of two 8-bit configuration (input or output selection), input port, output port, and polarity inversion (active-high or active-low operation) registers. At power-up, the I/Os are configured as inputs. The system master controller can enable the I/Os as inputs or outputs by writing to the I/O configuration bits. The data for each input or output is stored in the corresponding input or output register. The polarity of the input port registers can be inverted using the polarity inversion register. The TCA9555 is identical to the TCA9535 except that it includes internal I/O pull-up resistors, which pull the I/Os to a default high level when configured as inputs and left undriven. Three hardware pins (A0, A1, and A2) are used to program the I²C address, allowing up to eight TCA9555 devices to share the same I²C bus or SMBus. The TCA9555's fixed I²C address is the same as that of the PCF8575, PCF8575C, and PCF8574, allowing any eight of these devices to share the same I²C bus or SMBus.

Applications

• Servers
• Routers (telecom switching equipment)
• Personal computers
• Personal electronics
• Industrial automation equipment
• Products using GPIO-limited processors

Key features

• Standby current consumption max 3.5μA
• I²C to parallel port expander
• Open-drain active-low interrupt output
• 5V-tolerant I/O ports
• Compatible with most microcontrollers
• 400kHz fast I²C bus
• Configurable slave address with 3 address pins
• Polarity inversion register
• Latched outputs with high current drive capability for direct LED driving
• Latch-up performance exceeds 100mA per JESD78 Class II
• ESD protection exceeds JESD22 requirements
• 2000V Human Body Model (A114-A)
• 1000V Charged Device Model (C101)